Just to throw my hat into the ring about the whole Charles Barkley height thing - I tend to use his mugshot as a very loose reference. First, I figure he's wearing shoes in the picture, which is most often how heights are listed in the NBA. Second, I figure even if the mug shot weren't entirely accurate, it likely wasn't off by 3+ inches:

He probably had on dress shoes with an elevated heel to go with that shirt.